18842990 has 32 divisors (see below), whose sum is σ = 35195904. Its totient is φ = 7257600.

The previous prime is 18842981. The next prime is 18843023. The reversal of 18842990 is 9924881.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46790 + ... + 47190.

It is an arithmetic number, because the mean of its divisors is an integer number (1099872).

Almost surely, 2^18842990 is an apocalyptic number.

18842990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18842990 is a deficient number, since it is larger than the sum of its proper divisors (16352914).

18842990 is a wasteful number, since it uses less digits than its factorization.

18842990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 18842990 is about 4340.8512989965. The cubic root of 18842990 is about 266.1031032277.

The spelling of 18842990 in words is "eighteen million, eight hundred forty-two thousand, nine hundred ninety".